1 files changed, 31 insertions, 0 deletions
diff --git a/test/units/testsuite-53.sh b/test/units/testsuite-53.sh
new file mode 100755
index 0000000..84cd661
--- /dev/null
+++ b/test/units/testsuite-53.sh
@@ -0,0 +1,31 @@
+#!/usr/bin/env bash
+# SPDX-License-Identifier: LGPL-2.1-or-later
+set -eux
+set -o pipefail
+
+: >/failed
+
+# Reset host date to current time, 3 days in the past.
+date -s "-3 days"
+
+# Run a timer for every 15 minutes.
+systemd-run --unit test-timer --on-calendar "*:0/15:0" true
+
+next_elapsed=$(systemctl show test-timer.timer -p NextElapseUSecRealtime --value)
+next_elapsed=$(date -d "${next_elapsed}" +%s)
+now=$(date +%s)
+time_delta=$((next_elapsed - now))
+
+# Check that the timer will elapse in less than 20 minutes.
+((0 < time_delta && time_delta < 1200)) || {
+    echo 'Timer elapse outside of the expected 20 minute window.'
+    echo "  next_elapsed=${next_elapsed}"
+    echo "  now=${now}"
+    echo "  time_delta=${time_delta}"
+    echo ''
+} >>/failed
+
+if test ! -s /failed ; then
+    rm -f /failed
+    touch /testok
+fi